That's a problem if you're living in Wyoming but for the majority of the US population, low population density is not a factor. There are vast mostly empty area

That's a problem if you're living in Wyoming but for the majority of the US population, low population density is not a factor. There are vast mostly empty areas in the US, but people congregate in highly dense cities and suburbs. Take California, it's 93.3 /km^2, New York State is 159.2 /km^2, New Jersey is 459 /km^2, and DC is 3,886 /km^2.